# Slip Compensation

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Hi all!, I'm having some troubles with a VSD it's a mitsubishi F700 the motor is loosing power, I'm try to up with toorque boost Pr 0. but it's a little diference, I was reading about Slip compensation but not very sure how I can set it up, there are 3 parameters

Pr 245=Rated Slip from 0 to 50%

Pr 246=Slip compensation time constant from 0.01 to 10s

Pr 247=Constant-output region slip compensation selection

Not sure how I can set each one to working very well, without damage motor or vsd. any advice

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I'm try to up with torque boost Pr 0. but it's a little difference,

What thing is the difference?

You can increase the torque boost within max current limit. But first;

1) Is it a new application or a replacement?

2) What is the type of load?

3) What is the name plate info of motor and drive?

4) Do you face problem only during start up?

5) When motor loose power, what is the current, freq, and out put voltage?

Reply for better help

"Don't assume any thing, always check/ask and clear yourself".

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Hi thanks for respond, i get more data

The diference to increase the torque boost is in the output voltage, if I increas too high or too low output voltage decrease, so i decide to put in a 0.8.

It's a replacement first we had a VSD 40HP 220V, with 2 motor, and now we replace with to VSD 20HP 220V each one, the motor are for 220V, 15Hp.

Type of load i can't explain you by english, but it's to make cement block it's necesary to shake.

The problem is whe the drive show 68Hz it's a maximun frequency voltage is 220V, start with 35Amps and decresae to 25Amp I think that's the problem I need the current constant but i don't know how to do it.

What thing is the difference?

You can increase the torque boost within max current limit. But first;

1) Is it a new application or a replacement?

2) What is the type of load?

3) What is the name plate info of motor and drive?

4) Do you face problem only during start up?

5) When motor loose power, what is the current, freq, and out put voltage?

Reply for better help

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